In Part I we discussed making the mold. 1 piece flat molds are pretty easy. For multiple piece molds you need to think about how the mold will come apart to allow the master and subsequent cast parts to be removed. Don't follow me? Take a look at a kit body for example. Those unsightly seams we all have to sand off are actually mold lines where the pieces of a mold meet. Now visualize all the pieces that would be required.
Another thing about multi piece molds is that you need a way to pour the resin in and a way for the air it displaces to get out ( vent ) otherwise you will have huge air pockets in the finished piece.

Lets look at the 2 piece tire mold I made. Remember the nails that held it in place while I poured the first half? I left 2 in when I did the second half and now its time to enlarge the holes they left and clean them up a bit.Carefully cut the groove wider with an Exactohttp://images54.fotki.com/v1613/photos/1/11686/415169/IMGP1514-vi.jpg
When the halves are rejoined they should look like this http://images23.fotki.com/v860/photos/1/11686/415169/IMGP1515-vi.jpg
Now that that is ready a few more words on mulit piece molds. Sometiems even with a 2 piece you need a way to hold the piece up while Part 1 is poured, for this surfboard I made a 1/4 thick slab of clay on my glass and buried and blended the surfboard into it right up to the part ( halfway ) line.I poured the first half then turned the piece over, removed the clay added a few more legos to make the form deeper and then poured the second half.As you can see I also used a few small Legos as keys to hold the 2 halves togetherhttp://images116.fotki.com/v699/photos/1/11686/415169/IMGP1513-vi.jpg
If you want to learn more about multi piece molds I suggest you do some research into sculpture techniques and so on, theres way more than I can cover here.

There you have it, now its time to clean em up and paint em. You will need toi remove the mold release, I do this by washing several times in a degreasing dish soap.
You may have some very thin flash on the back of the pieces from the 1 piece flat molds, this can happen when you scrape the excess resin. Its easily taken off by sanding the back of the piece on a flat surface. Fill any pinholes with putty ( I use Bondo Glazing Putty ) Sand any seams flat.
Follow your normal painting steps.
I have been thinking that since the tires are cast in white I could paint them the correct shade of black and then sand back through to the white where the lettering is. Hopefully producing a nice tire with raised white lettering.

Peace and Good Luck
Dag

spoolin12

02-13-2004, 07:27 PM

Thanks for sharing this with us!

Great work! :)

D[X]P

02-13-2004, 08:40 PM

how did you make the molds?? It looks very nice

D[X]P

02-13-2004, 08:46 PM

nvm about the question. it looks great,makes me wana do it myself!!

chubbs36chambers

02-13-2004, 10:33 PM

This is a F*cken tight ass how to DAG65 now i can mold seats and wheels. Im going to get all of the supplies tommorow and start making seats, Wheels, Brembo Brakes and Engine parts :biggrin::biggrin::biggrin:

Vric

02-13-2004, 10:35 PM

really well made.. Hope this one found id way to the FAQ..

1ofaknd

02-13-2004, 11:15 PM

man..40 minutes to cure??? the resin i use cures in 10..and it's the thin clear/white stuff.

D[X]P

02-13-2004, 11:47 PM

really well made.. Hope this one found id way to the FAQ..
it better :smile:

Lownslow

02-14-2004, 03:08 AM

this will help thanks i always wonders bout that

aviv

02-15-2004, 08:29 AM

nice it will be very usefull!

DasWiesel

02-15-2004, 12:49 PM

:iagree:

labandabonnot

02-15-2004, 01:07 PM

Thanks! Thanks! Thanks! Thanks! Thanks! Thanks!

Midnight Racer

02-15-2004, 02:02 PM

Great tutorial.Plan on using it.

dag65

02-16-2004, 11:38 AM

man..40 minutes to cure??? the resin i use cures in 10..and it's the thin clear/white stuff.
Like I mentioned before there are all types and each has its own properties, I prefer one that is a little slower setting as it gives me a little more pour and fiddle time. As it is there is only a 7 minute pot life befor it starts to kick

Frazmanone

02-17-2004, 02:50 AM

Great tutorial, I was at the store today talking about casting and the tech told me that you can cast urethane for rubber like tires, and you can tint it black.

dag65

02-17-2004, 12:24 PM

Great tutorial, I was at the store today talking about casting and the tech told me that you can cast urethane for rubber like tires, and you can tint it black.
Yes , there are actually two part resis that remain somewhat soft, almost like hard foam rubber.

MadMonkey

06-04-2004, 10:05 AM

Do you think it would b possible to make a whole body using that method?

dag65

06-04-2004, 02:12 PM

Do you think it would b possible to make a whole body using that method?
Bodies require a more complex mold however the methods and materials are the same

MadMonkey

06-04-2004, 02:22 PM

cool

D[X]P

06-04-2004, 05:54 PM

holy shit, old thread batman

GvEman

06-04-2004, 07:11 PM

awsome!

Ran

03-08-2005, 04:08 AM

Amazing tutorial. Thanks for sharing this with us! :)

MercedesBenz

03-14-2005, 10:55 AM

Very cool, awsome tutorial,
I would love to do this, so i can replicate so many cars.
But just don't have the money/place/time to do this.

nugundam93

11-13-2006, 05:44 PM

sorry for the threadbump i haven't seen any answer to this yet and this seems to be the best thread to ask it.

would it be possible to make a negative of the part that you're casting? example, use a left hand as master and as end result, the right hand is made?

freakray

11-13-2006, 08:14 PM

would it be possible to make a negative of the part that you're casting? example, use a left hand as master and as end result, the right hand is made?

A negative is quite different to a mirror image or the symmetrical opposite of the part.

To answer your question, if a part is handed (LH is the opposite of the RH), there is no way I know of to make both parts from one, in your case, LH master.

nugundam93

11-13-2006, 11:22 PM

thanks ray!

brady_381need72c10

12-20-2006, 11:27 AM

is there any resin that cures to chrome?

freakray

12-20-2006, 12:25 PM

is there any resin that cures to chrome?

If you're referring to a chrome finish, no there is not. This is why chrome paints and chrome plating exists.

In future, please don't revive old threads for questions such as this.

Nick Gautreau

03-13-2007, 02:54 PM

Thanks for the info on how to cast....this will really come in handy duplicating a gear in my RC......